Jessica suffers from insomnia after hearing a loud noise. The mysterious noise, as when metal collides with concrete at high speed, seems to be heard only by her. She visits a sound engineer to reproduce it, and eventually befriends an archaeologist, who studies the remains found in a tunnel under construction. Perplexed by her experience, Jessica visits a doctor who is unable diagnose her symptoms. The secrets, however, seem to be unfolding when she encounters a man who remembers everything.